Can spinning frame

ABSTRACT

A centrifugal can-spinning spindle having its three components, i.e., bell-shaped can, distributing tubular thread guide and pretwisting tubular thread guide, all mounted on a single common support member for mounting as a unit on a spinning frame.

United States Patent 91 Gardella I 22 Filed:

I CAN SPINNING FRAME [76] Inventor: Adriano M. Gardella, 24 B, Via a1 Capo di Santa Chiara, Genoa, Italy May 4, 1971 [21] App]. No.: 140,049

30 Foreign Application Priority Data 2,900,782 8/1959 Bobkowicz ..57/34 CF 2,664,696 l/l954 Quast ..57/77X 2,046,965 7/ 1936 Panoff ..57/77 FOREIGN PATENTS-OR APPLICATIONS Primary Examiner-Werner H. Schroeder Attorney-Bennan, Davidson & Berman 57 ABSTRACT A centrifugal can-spinning spindle having its three components, i.e., bell-shaped can, distributing tubular thread guide and pre-twisting tubu1ar thread guide, all

mounted on a single common support member for I mounting as a unit on a spinning frame.

9 21 Claims, 11 Drawing s/19s7 Italy ..57/76 PATENTEDMARNIQY;

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' SHEETBOF 6 INVENTOR M gfgmm/ AT'ToRNEYs- CAN SPINNING FRAME BACKGROUND OF THE INVENTION The invention relates to centrifugal can-spinning spindles, and in particular to such spindles for use in spinning hemp, jute, linen, kenaf hemp, asbestos and like fibers. These spindles are adapted to produce yarns wound up in hollow-core bobbins, and generally comprise a bell-shaped can rotatably suspended by itstubular neck so as to turn at a high speed about its axis, a distributing tubular thread guide co-axially fitted from above into the bell-shaped can through the neck thereof and being imparted a reciprocating upward and downward motion; and a pre-twisting tubular thread guide with arranged co-axially with the distributing thread guide, between this latter and the overlying drafting unit, so as to be capable of positively turning about its own axis, in the same direction as the bellshaped can, but not being axially shiftable. The distributing thread guide and the pre-twisting thread guide are telescopically engaged with one another.

In this type of centrifugal can-spinning spindles, the sliver or roving coming out of the drafting unit passes through the pre-twisting thread guide and thenthrough the distributing thread guide, and penetrates into the underlying bell-shaped can, where, by centrifugal force, it is deposited onto the inner wall of said can. Simultaneously, owing to the rotation of the bellshaped can, the sliver is twisted and is thus made into a yarn which, owing to the upwardly and downwardly reciprocating motion of the distributing thread guide, forms, in the inside of the bell-shaped can, a bobbin having intercrossed concentrical layers. The pre-twisting thread guide serves for the automatic re-starting of the spinning, i.e. for the automatic re-atta'ching of the yarn in case of its breakage during the spinning, and for the automatic starting of any new spinning operation after the discharge of the finished bobbin. To this end, the pre-twistingthread guide is caused to positively turn either in a continuous manner, or at least temthe said thread guide, is subjected to some preliminary I twistingtaking place in the same direction as the final twisting of the spinning and permits the automatic im mediate starting of the real and proper spinning of said partially pre-twisted sliver, as soon as the same penetrates into the bell-shaped can.

In the known centrifugal can-spinning spindles of the afore-mentioned type, the bell-shaped can, the distributing thread guide and the pre-twisting thread guide are separately mounted onto the spinning machine frame. This involves a construction which is rather complicated and costly, since it requires, for example, an accurate alignment of the supporting bearings of the three aforementioned members, and therefore a corresponding great accuracy in machining, assembling andadjusting works, for which much time is required since the three principal members (bell-shaped can, distributing thread guide-and pre-twisting thread guide) have to be mounted separately, and to be centered and aligned with one another, directly onto the spinning machine flame, under conditions of accessibility which are not always easy. During such time as is required for mounting and dismounting one spindle, all the spindles in the spinning machine haveto be stopped, and output of the spinning machine ceases.

SUMMARY The invention aims at simplifying and reducing the number of the parts constituting the spindle, and also at eliminating the aforementioned drawbacks, and to this end provides a centrifugal can-spinning spindle of the kind as described, wherein the bell-shaped can, the distributing thread guide, and the pre-twisting thread guide are supported in a support and mountable as a unit on the spinning machine frame. By this construction, the aforementioned three members of the spindle or spinning unit come to constitute a single constructional unit and can be mounted and dismounted all together. More specifically, the bell-shaped can, the distributing thread guide, and the pre-twisting thread guide can be mounted together onto their common supporting member outside of the spinning machine,

and the constructional unit thus' prepared can be located in position in the spinning machine frame simply and quickly, thus eliminating the need for providing in the frame a plurality of accurately machined and correlated separate supporting bearings and minimizing the stopping time of the other spindles in the spinning machine.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The removable supporting member, which is common to the bell-shaped can and to both thread guides, can be'constructed and mounted onto .the spinning machine frame in any suitable manner. According to a preferred embodiment of the invention, the said supporting member is constituted by a sturdy bushing which may be composed of two or more interconnected co-axial sections, and is provided with means, such as flanges, external lugs, or like means, by which it rests upon the spinning machine frame and is removably securedth ereto. In this supporting bushing, the bell-shaped can, the distributing thread guide, and the pre-twisting thread guide constituting the spindle are mounted through suitable bearings. The supporting thread guide in this preferred embodiment is provided with slots through which are passed the means for the rotational driving of the bell-shaped can and for the reciprocating movement of the distributing thread guide, and possibly also for the rotational driving of the pre-twisting thread guide.

According to a further aspect of the invention, the single supporting member is mounted on the spinning machine frame by elastic members, and in such a manner as to allow limited pendulum-like swinging movements of said supporting member, and therefore of the whole spindle or spinning unit in one or more directions. In this way, any possible unbalance due to any unevenness of the yarn being deposited in the bellshaped can are automatically compensated for, and thus pendulum-like swinging spindle will generally be set at an axis being in function of the aforementioned unbalance. By this elastic pendulum-swinging connection, the vibrations being originated by said unbalance BRIEF DESCRIPTION THE DRAWINGS FIG. 1 shows a vertical section through a centrifugal can-spinning spindle according to the invention,

FIG. 2 shows, in enlarged scale, a vertical section through the thread-drawing grippers of the reciprocat- 'ing distributing thread guide,

FIG. 3 shows a vertical section in enlarged scale through the means for the elastical pendulum-like swinging anti-vibrating suspension of the spindle from the spinning machine frame,

, FIG. 4 is a cross-section, in an enlarged scale, on line IVIV of FIG. 1, I

FIG. 5 is a vertical section through another embodiment of the centrifugal can-spinning spindle according to the invention,

FIG. 6 is a cross-section in enlarged scale, on line VI-VI of FIG. ,5,

FIG. 7 is a 'vertical section, in an enlarged scale, showing the means for the elastic anti-vibrating suspension of the spindle shown in FIG. 5,

FIG. 8 is a section on line VIII-VIII of FIG. 5, and shows in plan view the means for mounting the spindle onto the spinning machine frame,

FIG. 9 shows in a vertical section another embodiment'of (themeans) for mounting the spindle onto the spinning machine frame, there beingshown only the common supporting bushing of the bell-shaped can and of both the distributing and pre-twisting guides, and

FIGS. 10 and, 11 are transversal cross-sections on lines X-X and XIXI of FIG 9.

Referring to FIGS. '1 to 4, the centrifugal canspinning spindle for use in spinning hemp, jute, linen and other like fibers, asbestos includedjcomprises a bell-shaped can 1, a distributing tubular thread guide 2 and a pre-twisting tubular thread guide 3. These three basic members of the spindle are mounted in one single upright supporting bushing, which is denoted as a whole by 4 andis in its turn removably mounted in a pendulum-like anti-vibrating manner onto the spindle rail 5 of the spinning machine.

Particularly, the supporting bushing 4 is constituted by two superposed co-axial sections 104 and 204 which are connected together by means of screws 6. The bell shaped can 1 is mounted-by means of its upper tubular neck 101', and by means of ball or like bearings 7, 8 in the lowermost section 104 of the supporting bushing In the inside of bushing-4, the neck 101 of the bellshaped can 1 is provided with a pulley 9,'in which is engaged a belt 10 (not shown in FIG. 1 but similar to that shown in FIG. 5) for rotationally driving the said bellshaped can 1. The lower section 104 of the supporting bushing 4 has a number of slots which are well visible in FIG. 4, and through which the driving belt 10 is passed.

The distributing thread guide 2, which during the spinning is imparted an upward and .downward reciprocating motion, is housed axially slidably in the neck 101 of the bell-shaped can 1 so as to axially slide therewithimand is supported by a lower ball-bearing l1 housed in the top portion of the same bell-shaped can 1, and as well by an upper ball-bearing l2 housed in the supporting bushing 4 above the bearing 8 of the bell-shaped can 1. It is to be noted that the distributing thread guide 2 is slidably mounted through both bearings 11 and 12. I

The reciprocating motion of the distributing thread guide 2 is promoted in a known manner by a movable bench 13, the so-called carriage, generally being cornmon to a plurality of spindles, which is caused vertically to slide in the spinning machine frame, by being guided for example along columns 140 (see FIG. 6), and is imparted an upward and downward motion. The distributf ing thread guide 2 is connected by suitable means to the said carriage 13 in a readily and quickly mountable and dismountable manner. In the embodiment as shown in FIGS. l to 4, onto the carriage 13 there is provided a gripper l4 projecting in the inside of the supporting bushing 4,'through a longitudinal slot 304 cut in the upper section 204 of said bushing 4, and clamping a flange 15 which is fastened to the upper end portion of the distributing thread guide 2. A preferred constructional embodiment of said gripper 14 is shown in FIG.

2. Referring to this Figure, the gripper 14 comprises a fixed'claw 114, secured to the carriage 13 by means of a screw 16 and a movable claw 214 mounted onto the said screw 16, by providing such a clearance'as to allow the said claw to be moved relatively to the fixed claw 1 14. The gripper 14 is closed and opened by means of a locking screw 17 which is screwed in the carriage 13 and acts through a spring 18 upon a rear extension'3'14,

of the movable claw 214. In FIG. 1, there is shown by fiill lines the lower position, and by dash-and-dot lines the upper position of the carriage 13 supporting the gripper 14, which entrains the distributing thread guide 2. The said gripper, besides providing the upward and downward motion of the distributing tubular thread guide, also permits the pendulum-like swinging move- I ments of the unit. Furthermore, the said gripper permits the rotation of the distributing thread guide whenever the yarn might recoil uponthe same thread guide.

The pre-twisting thread guide 3, which is arranged co-axially to the distributing thread guide 2, between this latter and the overlying drafting unit (not shown) is rotatably suspended by means of a ball-bearing 19 from the upper end of the supporting bushing 4, but is not allowed to slide axially. The lower end of the pre-twisting thread guide 3 is slidably telescoped in the distributing thread guide 2, through a guide sleeve 20 made of a self-lubricating material. Atthe upper end of the pretwisting thread guide and upon-the supporting bushing 4 there is fitted a pulley 21 for rotatably driving the said thread guide 3.

In the inside of the bell-shaped can 1, underneath the top portion thereof, an annular disc 22 is provided for ejecting the conical bobbin R. The said bobbin-ejecting disc 22 is carried by pins 23 which are slidably mounted in corresponding holes in the top portion of the bellshaped member 1. The outer ends of these pins 23 are connected together by means of a ring 24. Between the spindle rail 5 andthe ring 24 there is arranged a discharging plate 25, which can be vertically shifted in an upward and downward direction, and which co-acts with at least a part of ring 24. During the spinning, that is, during the rotation of the bell-shaped can 1, the discharging plate 25 is uplifted with respect to the ring 24. Upon completion of the spinning, once the bellshaped can 1 has been stopped, the discharge plate 25 will be temporarily lowered, whereby the ring 24, together with the pins 23 and the bobbin-ejecting disc 22, are downwardly shifted, thus pushing the wound-up bobbin R out of the bell-shaped can 1.

From the foregoing, it is apparent that the three principal members of the spindle, i.e., the bell-shaped can resilient material, such as rubber and the like, are

fitted. The-bushings26, 27 have inner annular flanges 126, 127 formed ,in their upper ends, which flanges are superposed to one another and restupon the top face of the lugs 404 of the supporting bushing 4. That portion of the bushing 4 which has the lugs 404 and is surroundedby the two bushings '26, 27, is housed in a circular through bore 105 in the spindle rail 5, whose diameter is substantially the same as the outer diameter of the rubber bushing 27. Upon the inwardly extended flanges 126, 127 of bushings 26, 27, rests an annular disc 28, which projects laterally all around beyond the rubber bushing 27 and is accommodated in a corresponding upper annular recess of, the spindle rail 5. This annular disc 28 is fastened to the side lugs 4040f the supporting bushing 4 by means of stud bolts 29 and of their corresponding upper nuts, while the same is fastened to the spindle rail 5 by means of screws 31. Beneath the nuts 30, there is arranged a flat metallic ring 32 spaced from the underlying flange 126 of the metallic bushing 26 by means of metal sleeves 33 which are threaded on studs 29 and are passed through bores drilled in the flange 127 of the rubber bushing 27 and in the annular disc 28. Between the said annular disc 28.

and the flat metallic ring 32 there is fitted a flat ring 34 made of a resilient material, such as rubber or the like, and being traversed by the spacer sleeves 33. The metallic ring 32 and the rubber ring 34 are housed in a corresponding circular upper'recess in the annularidisc 28. The rubber ring 34 has an upwardly projecting rim which is fitted between the metallic ring 32 and the disc 28. The central bore in the annular disc 28, and also the bores drilled in the same, through which are passed the spacer sleeves 33, are made so wide as to prevent the metalor said disc 28 from coming in any way into contact with the supporting bushing 4 and with the spacer sleeves 33, as is apparent in FIG. 3.

In this way, the annular disc 28 comes to constitute a flange fastened to the sleeve 4 with the interposition of resilient pads constituted by the rubber ring 34 and by theflange 127 of the rubber bushing 27. The supporting bushing is centered in the spindle rail 5 by means of the rubber bushing 27. Consequently, the supporting bushing 4, and therefore the whole spindle which with said bushing constitutes a constructional unit, are allowed to perform small elastic pendularswinging movements in all directions relatively to the spindle rail 5 of the spinning machine. In this way, any possible machining tolerances are automatically compensated and, above all, the transmission of any vibration from the spindle to the spinning frame, and vice-versa is prevented.

In order to mount onto the spindle rail 5' of the spinning machine the constructional unit being constituted by the supporting bushing 4, the bell-shaped can 1 and the two thread guides 2, 3, the supporting bushing 4 is fitted from below into the corresponding bore 1050f said rail 5. To this end, the discharging plate 25 has a bore 125 which is drilled co-axially to the bore 105 in the spindle rail 5 and is provided with three 1 recesses 225 which are angularly offset in the same 404 relatively to the said recesses 125, as is apparent in FIG. 4. The bushings 26, 27, the annular disc 28 and the two flat rings 34 and 32 are subsequently mounted from above, while the locking in position-of saidmembers is then effected by means of nuts on studs 29 and by means of screws 31. i

During the spinning, the bell-shaped can 1 is closed at its lower end by means of a plate which, once the spinning has been completed, is lowered in order to open the can 1 and to allow the discharging of the bobbin R. This plate 35 has a funnel-shaped central portion 135 and is peripherally provided with angularly spaced downwardly extended elastic blades 235. Each one of these blades 235 has a projection on its outer face,

while the bell-shaped can has an annular groove table 36, which is shown with dash-and-dot lines in FIG. 1, an annular disc 38 is fixedly mounted by means of posts 37. The funnel-shaped central portion of the overlying plate 35 is fitted in the central bore in the annular disc 38 and carries beneath the said disc a counter-plate 39. The distance between plate 35 and the underlying counter-plate 39 integrally mounted thereto, is so selected as to obtain the following operation. a

At any time when the shiftable table 36 is lowered, the plate 35 is driven out of the bell-shaped can 1 and bears against the'annular disc 38. Whenever the table 36 is lifted up, the plate 35 comes to be fitted in the bell-shaped can 1 and the outward projections of the elastic blades 235 are snapped into engagement with the inner annular groove of the said bell-shaped can. The plate 35 is thus fastened to the can 1. The table 36 is then lowered down slightly, so as to bring the annular disc 38 in an intermediate position between the plate 35 and its counter-plate 39, as shown in FIG. 1. In this way, during the spinning, the plate 35 turns freely,

into the surrounding atmosphere, while their inner ends are set into communication with an annular collecting channel 61, which is open towards the inside of the bell-shaped can 1. The radial bores 60 preferably have flared outer ends, while the annular collecting channel 61 is covered by means of a replaceable cover 62 arranged in the inside of thebell-shaped can 1 onto the top part thereof and provided with ring-like arranged slanting through bores 63 which are set into communication with the said collecting channel 61. By the effect of the rotation of the funnel-shaped can 1, a certain amount of air is caused to flow from said can outwardly, through the inclined bores 63 in cover 62, the annular collecting channel 61and the radial bores 60. A vacuum is thereby generated in'the inside of the bell-' shaped can 1, which causes a descending air stream to' continuously flow through the pre-twisting' thread guide 3 and the distributing thread guide 2. This descending air stream facilitates the coming down of the'roving during the initial stage of the spinning operation or during the re-starting stage, after a breakage of the yarn or of, the roving; By substituting the cover 62, which is provided for controlling the'air outflow from the bell-shaped can 1, with another'cover whose bores 63 differ from the bores in cover 62 as to their size,

- and/or their number, and/or their angle, it is possible to obtain different suction effects relatively to the amount of turning of the bell-shaped can and/or the kind of fiber being manufactured.

The embodiment as shown in FIGSJS to 8 substantially corresponds to, the embodiment as shown in FIGS. 1 to 4, like parts being indicated by like reference numerals. The difference primarily resides in the feature that the reciprocating distributing thread guide 2 is suspended by means of a ball-bearing 12in a head 40 which is vertically slidable in the upper section 204 of the supporting bushing 4 and is imparted an upward and downward motion. To this end, the head 40 is coupled by means of two radially arranged co-axial trunnions 41 to a driving fork 42 which is mounted onto the carriage 13 which in turn, as shown particularly in FIG. 6, is upward and downwardly slidable upon the upstanding guides 140. The leg 142 of the driving fork 42 is pivotally mounted in a bushing 43 carried by an arm 113 of carriage 13, so as to axially and in combination with.

slide therewithin. In this way, the pivotal connection of head 40 to the driving fork 42, by means of trunnions 41, between the reciprocating carriage13 and the spindle assembly being constituted by the supporting bushing 4 and the members 1, 2, 3 and being mounted in an elastically pendulumlike swingable and vibration-damping manner onto the spindle rail of the spinning machine, relative movements are allowed to freely occur in all directions, even though the head 40 is secured to said carriage 13. The trunnions 41 are fitted through slots longitudinally cut in the upper section 204 of the supporting bushing 4.

The rotation of the distributing thread guide 2 can be braked with an adjustable force by means of a small shoe brake 44, mounted in the head 40, which can be operated by means of a thumb screw 45, as shown in FIG. 6. The pre twisting guide 3 is suspended from the upper end of the supporting bushing 4 by means of a rolling bearing 19 and is also guided by a rolling hearing 120 mounted in the head 40, through which the said thread guide 3 is slidably passed.

For mounting the supporting bushing 4 onto thespinning machine spindle rail 5, in a vibration-damping pendulum-like swingable manner, the rail 5 is provided with a circular through bore 105 having three angularly equi-spaced inner brackets 205,- while in proximity of its lower end the bushing 4 is provided with three sideward projecting lugs 404 being samely equi-spaced, as is apparent from FIG. 5, and particularly from FIG. 8. The dischar 'ng plate 25 is provided with a corresponding co-axi bore 125 having three angularly equispaced recesses 225 which are fitted in position between the brackets 205 projecting from the bore 105 in the spindle rail 5. The supporting bushing 4, with the can 1 and the thread guides 2, 3 mounted thereinto, is fitted from below, through the bore 125 in the discharging plate 25 and the bore 105 in the spindle rail 5, by having the lugs 404 so trimmed that the same pass through the recesses 225 in the discharge plate 25 and between the brackets 205 of the spindle rail 5. The bushing 4 is then rotated,,so that its lugs 404 come to bearupon the brackets 205 to which these lugs are fastened by meansv of screws 145 and of elastic bushings 46 0f the type known under the trade name of Silent- 'block, or a like type, as shown particularly in FIG. 7.

In FIGS. 9 to 11, there is I shown, another way of mounting the supporting bushing 4 onto the spinning machine in a vibratiomdamping pendulum-like swingable manner. In these Figures, only the supporting bushing 4 and the means for fastening the same to the spinning machine frame are shown, while, for claritys sake, the bell-shaped can 1 and the two thread guides 2,

- 3, which are carried by said bushing, and which can be mounted for example as described with reference to FIGS. 1 to 4, or 5 to 8, have not been shown. While in the embodiments as shown in FIGS. 1 to 8, the supporting bushing 4 ismounted by its lower end to the spinning machine spindle rail 5, in the embodiment as shown in FIGS. 9 to 11, the supporting bushing 4 is suspended by its upper end, in an elastically pendulumlike swingable manner, from a fixed upper spindle rail 47 of the spinning machine. To this end, a stirrup 49 is fastened by means of screws 48 to the upper section 204 of the supporting bushing 4 and'is suspended from the spindle rail 47 by means of bolts 50 and of elastic bushes 51 of the type known under the trade name of Silentblock, or a like type. The upper end of bushing 4 is passed, with an appreciable radial clearance, through a bore in rail 47, so as to cause the same to project thereabove. The circular gap between the bushing 4 and the spindle rail 47 is closed by an elastic annular joint covering 52.

The lower end of the supporting bushing 4 is passedrail and is fastened to the same by means of fastening sectors 54. The rubber bush 53 has its inner face adhering against the outer wall of the supporting bushing 4, while its outer side adheres against the wall of the bore in the spindle rail 5, and in the face turned towards the bushing 4 is provided with vertical grooves 253 which allow the said bush to be elastically deformed in a radial direction. In this way, the supporting bushing 4 which is suspended by its upper end from the upper spindle rail 47 by means of bolts 50 and of the rubber bushing 51, and by its lower end is centrally positioned in the bore drilled in the lower spindle rail 5, by means of the rubber bushing 53, is allowed to perform limited elastic pendulous swinging movements in all directions.

Of course the invention is not limited to the just specified and shown embodiments, but can be widely varied and modified, and the more so in construction, without departing fromthe leading principle as above described and claimed hereinafter.

I claim:

1. A centrifugal can spinning spindle for use with an associated spinning machine and draft unit for producing yarns wound in hollow core bobbins comprising a supporting member, a bell-shaped can having a tubular neck extending upwardly centrally from its top, said bell-shaped can being suspended by its tubular neck from and below said supporting member, means for rotating said bell-shaped can about its axis, a tubular thread distributing guide coaxially fitted from above into thebell-shaped can through its tubular neck and extending downwardly within the canto a level near the bottom defining a lower position, means for vertically reciprocating said thread distributing guide between said lower position and a raised position wherein the lower end of the thread distributing guide is near the upper end of the bell-shaped can, said distributing thread guide being axially slidably mounted in a lower bearing provided in the neck of the bell-shaped can and in an upper bearing provided in the supporting member, a tubular pre-twis'ting thread guide arranged coaxially with the tubular thread distributing guide, and

means for positively driving said tubularpre-twistingthread guide about its own axis in the same direction as the bell-shaped can is driven at least at the re-starting of spinning but retaining said tubular pre-twisti rrg' thread guide axially stationary, said distributing thread guide and said pre-twisting thread guide being also mounted in said supporting member and thereby being mountable with said bell-shaped can as a unit in the frame of an associated spinning machine.

2. A spindle according to claim 1, wherein the supporting member is provided near its upper end with a plurality of stirrups each housing an elastic bushing for receiving a mounting bolt for attachment to a spinning machine frame, whereby upon mounting the spindle on a spinning machinethe spindle is permitted limited pendelum-like swinging movements which inhibit the transmission of vibrations from the spindle to th spinning machine frame, and vice versa.

3. A spindle according to claim 1, wherein the supporting member is constituted by a supporting bushing and'is provided with slots through which are passed the means for rotationally driving .the bell-shaped can and for reciprocating the distributing thread guide.

4. A spindle according to claim 3, wherein the sup port bushing is formed of two or more interconnected co-axial sections.

5. A spindle according to claim 1, wherein the tubular neck of the bell-shaped can is mounted in the supporting member by means of two axially spaced roller provided a head axially slidable and guided in the upper portion of said cylinder, said distributing thread guide being rotatably suspended in said head, said'head being connected to said means for vertically reciprocating the distributing thread guide.

8. A spindle according to claim '7, wherein said pretwisting thread guide which is rotatably suspended from the upper end of the supporting member is slidable axially in a bearing provided in said sliding head.

9. A'spindle according to claim 1, wherein the means for vertically reciprocating the distributing thread guide includes a gripper carried by a vertically reciprocating carriage slidably mounted in a spinning machine frame, said gripper having clamping jaws including resilient clamping blocks engaging a portion of said distributing thread guide.

10. A spindle according to claim 7, wherein said means for vertically reciprocating the distributing thread guide includes a fork carried by a vertically reciprocating carriage slidably mounted in a spinning machine frame, said fork being attached to said sliding head by trunnions which pass through vertical slots in the cylindrical wall of the supporting member.

11. A spindle according to claim 9, wherein said resilient clamping blocks of the gripper are clamped in a hinged and limited slidable manner to a. collar having a projecting annular flange secured to said portion of the distributing thread guide, said supporting member being also supported by resilient means which secure the supporting member to a spindle rail or like part of a spinning machine frame, whereby limited pendulous swinging movements of the spindle relative to the spinning machine frameare permitted.

12. A spindle according to claim 7, wherein said supporting member is suspended by its upper end from a fixed spindle rail of a spinning machine.

13. A spindle according to claim 1, wherein said supporting member is a hollow cylinder which is provided near its lower end with means for mounting onto a spindle rail of the spinning machine, said mounting means including a plurality of lateral lugs protruding from the exterior surface of the supporting member and at least one resilient bushing surrounding the supporting member and having an inturned flange overlying said lateral lugs and which acts as the bearing surface when the supporting member is mounted on a spinning machine. I

14. A spindle according to claim 13, wherein said supporting member has at least three of said lateral lugs which are angularly spaced andsupported in a bore of a fixed spindle rail on a'spinning machine, and wherein a discharging plate is arranged to be vertically shiftable between said bell-shaped can and said fixed spindle rail, the discharging plate being provided with a corresponding bore having angularly spaced recesses for passing the lateral lugs of the supporting member during assembly of the spindle with the spindle rail.

15. A spindle according to claim 13, wherein said means for mounting the supporting member further includes an annular support disc having an inwardly projecting flange overlying said inturned flange of the resilient bushing and through which fastening means are applied for elastically supporting the lateral lugs from the spindle rail.

16. A spindle according to claim 12, wherein a bore in the spindle rail has angularly equi-spaced inwardly projecting brackets so arranged as to allow correspondingly spaced lateral lugs on the supporting member to pass between these brackets at the time the supporting member is being fitted from below in the spindle rail bore, and upon which brackets the lateral lugs of the supporting member are subsequently positioned after havingsuitably turned said supporting member, and bolts surrounded by elastic bushings" being provided as means for fastening the lugs to the brackets.

17. A spindle according to claim 12, wherein to the upper end of the supporting member there are fastened a plurality of stirrups which are suspended from an upper spindle rail of the spinning machine by bolts' surrounded with bushings made of elastic material, the

lower end of said supporting member being engaged in a bore in a lower spinning rail of the spinning machine in which bore the lower end of the supporting member is centered by an elastic bushing.

18. A centrifugal 'can-spinningspindle according to shaped can, which plate has a central downwardly extending projection which is passed with a substantial clearance through a bore in an underlying vertically shift'able control member, while under the said control member said plate projection is provided with an abutment member co-operating with the said control member, the plate being fitted in the bell-shaped can and being fastened thereto by lifting the control member, and being disengaged and disconnectedfrom the bell-shaped member by lowering the control member. when the same is in engagement with the said abutment member, the distance between the plate and the abutment member, in correspondence of the lower .end of the plate central projection being selected in such a manner that the control member is allowed to assume an intermediate position, in which it does not said bell-shaped can by an annular collecting channel and by annularly spaced slanting through bores provided in a replaceable limiting cover mounted within the bell-shaped can adjacent the top thereof, whereby to cause a descending airstream to flow through the pre-twisting thread guide and the distributing thread I guide.

claim 1 having a rotatable vertically shiftable platewhich is provided for closing the lower end of the bell- 21.1'A spinning machine in combination with at least one spindle as claimed in claim 1. 

1. A centrifugal can spinning spindle for use with an associated spinning machine and draft unit for producing yarns wound in hollow core bobbins comprising a supporting member, a bell-shaped can having a tubular neck extending upwardly centrally from its top, said bell-shaped can being suspended by its tubular neck from and below said supporting member, means for rotating said bell-shaped can about its axis, a tubular thread distributing guide coaxially fitted from above into the bell-shaped can through its tubular neck and extending downwardly within the can to a level near the bottom defining a lower position, means for vertically reciprocating said thread distributing guide between said lower position and a raised position wherein the lower end of the thread distributing guide is near the upper end of the bell-shaped can, said distributing thread guide being axially slidably mounted in a lower bearing provided in the neck of the bell-shaped can and in an upper bearing provided in the supporting member, a tubular pre-twisting thread guide arranged coaxially with the tubular thread distributing guide, and means for positively driving said tubular pre-twisting thread guide about its own axis in the same direction as the bell-shaped can is driven at least at the re-starting of spinning but retaining said tubular pre-twisting thread guide axially stationary, said distributing thread guide and said pre-twisting thread guide being also mounted in said supporting member and thereby being mountable with said bell-shaped can as a unit in the frame of an associated spinning machine.
 2. A spindle according to claim 1, wherein the supporting member is provided near its upper end with a plurality of stirrups each housing an elastic bushing for receiving a mounting bolt for attachment to a spinning machine frame, whereby upon mounting the spindle on a spinning machine the spindle is permitted limited pendelum-like swinging movements which inhibit the transmission of vibrations from the spindle to the spinning machine frame, and vice versa.
 3. A spindle according to claim 1, wherein the supporting member is constituted by a supporting bushing and is provided with slots through which are passed the means for rotationally driving the bell-shaped can and for reciprocating the distributing thread guide.
 4. A spindle according to claim 3, wherein the support bushing is formed of two or more interconnected co-axial sections.
 5. A spindle according to claim 1, wherein the tubular neck of the bell-shaped can is mounted in the supporting member by means of two axially spaced roller bearings.
 6. A spindle according to claim 1, wherein the pre-twisting thread guide is rotatably suspended from the upper end of the supporting member, and is guided in a bearing provided at the upper end of the distributing thread guide so as to axially slide therewithin.
 7. A spindle according to claim 1, wherein said supporting member is a hollow cyliNder and wherein is provided a head axially slidable and guided in the upper portion of said cylinder, said distributing thread guide being rotatably suspended in said head, said head being connected to said means for vertically reciprocating the distributing thread guide.
 8. A spindle according to claim 7, wherein said pre-twisting thread guide which is rotatably suspended from the upper end of the supporting member is slidable axially in a bearing provided in said sliding head.
 9. A spindle according to claim 1, wherein the means for vertically reciprocating the distributing thread guide includes a gripper carried by a vertically reciprocating carriage slidably mounted in a spinning machine frame, said gripper having clamping jaws including resilient clamping blocks engaging a portion of said distributing thread guide.
 10. A spindle according to claim 7, wherein said means for vertically reciprocating the distributing thread guide includes a fork carried by a vertically reciprocating carriage slidably mounted in a spinning machine frame, said fork being attached to said sliding head by trunnions which pass through vertical slots in the cylindrical wall of the supporting member.
 11. A spindle according to claim 9, wherein said resilient clamping blocks of the gripper are clamped in a hinged and limited slidable manner to a collar having a projecting annular flange secured to said portion of the distributing thread guide, said supporting member being also supported by resilient means which secure the supporting member to a spindle rail or like part of a spinning machine frame, whereby limited pendulous swinging movements of the spindle relative to the spinning machine frame are permitted.
 12. A spindle according to claim 7, wherein said supporting member is suspended by its upper end from a fixed spindle rail of a spinning machine.
 13. A spindle according to claim 1, wherein said supporting member is a hollow cylinder which is provided near its lower end with means for mounting onto a spindle rail of the spinning machine, said mounting means including a plurality of lateral lugs protruding from the exterior surface of the supporting member and at least one resilient bushing surrounding the supporting member and having an inturned flange overlying said lateral lugs and which acts as the bearing surface when the supporting member is mounted on a spinning machine.
 14. A spindle according to claim 13, wherein said supporting member has at least three of said lateral lugs which are angularly spaced and supported in a bore of a fixed spindle rail on a spinning machine, and wherein a discharging plate is arranged to be vertically shiftable between said bell-shaped can and said fixed spindle rail, the discharging plate being provided with a corresponding bore having angularly spaced recesses for passing the lateral lugs of the supporting member during assembly of the spindle with the spindle rail.
 15. A spindle according to claim 13, wherein said means for mounting the supporting member further includes an annular support disc having an inwardly projecting flange overlying said inturned flange of the resilient bushing and through which fastening means are applied for elastically supporting the lateral lugs from the spindle rail.
 16. A spindle according to claim 12, wherein a bore in the spindle rail has angularly equi-spaced inwardly projecting brackets so arranged as to allow correspondingly spaced lateral lugs on the supporting member to pass between these brackets at the time the supporting member is being fitted from below in the spindle rail bore, and upon which brackets the lateral lugs of the supporting member are subsequently positioned after having suitably turned said supporting member, and bolts surrounded by elastic bushings being provided as means for fastening the lugs to the brackets.
 17. A spindle according to claim 12, wherein to the upper end of the supporting member there are fastened a plurality of stirrups which are suspended from an upper spindle rail of the spinning machine by bolts surrounded with bushings made of elastic material, the lower end of said supporting member being engaged in a bore in a lower spinning rail of the spinning machine in which bore the lower end of the supporting member is centered by an elastic bushing.
 18. A centrifugal can-spinning spindle according to claim 1 having a rotatable vertically shiftable plate which is provided for closing the lower end of the bell-shaped can, which plate has a central downwardly extending projection which is passed with a substantial clearance through a bore in an underlying vertically shiftable control member, while under the said control member said plate projection is provided with an abutment member co-operating with the said control member, the plate being fitted in the bell-shaped can and being fastened thereto by lifting the control member, and being disengaged and disconnected from the bell-shaped member by lowering the control member when the same is in engagement with the said abutment member, the distance between the plate and the abutment member, in correspondence of the lower end of the plate central projection being selected in such a manner that the control member is allowed to assume an intermediate position, in which it does not come into contact either with the plate being engaged with the bell-shaped member, or with the said lower abutment member or counter plate.
 19. A spindle according to claim 18, wherein the plate has peripherally arranged elastic blades which are adapted to be snapped into engagement with the bell-shaped can.
 20. A spindle according to claim 1, wherein said bell-shaped can has in its top portion radial bores opening peripherally into the outside atmosphere, said bores communicating at their inner ends with the interior of said bell-shaped can by an annular collecting channel and by annularly spaced slanting through bores provided in a replaceable limiting cover mounted within the bell-shaped can adjacent the top thereof, whereby to cause a descending airstream to flow through the pre-twisting thread guide and the distributing thread guide.
 21. A spinning machine in combination with at least one spindle as claimed in claim
 1. 